CN1299150C - Display and control method thereof - Google Patents

Display and control method thereof Download PDF

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Publication number
CN1299150C
CN1299150C CN 01133175 CN01133175A CN1299150C CN 1299150 C CN1299150 C CN 1299150C CN 01133175 CN01133175 CN 01133175 CN 01133175 A CN01133175 A CN 01133175A CN 1299150 C CN1299150 C CN 1299150C
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circuit
display
signal
selected
display device
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CN 01133175
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CN1345024A (en
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筒井雄介
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三洋电机株式会社
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3648Control of matrices with row and column drivers using an active matrix
    • G09G3/3659Control of matrices with row and column drivers using an active matrix the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0857Static memory circuit, e.g. flip-flop
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/021Power management, e.g. power saving

Abstract

本发明的课题是一种显示装置,谋求能对应于全色动态图像显示和灰度级数少的静止图像显示(数字显示模式)这样两种显示、同时大幅度降低包括显示装置上外接的外部LSI的全部显示系统的功耗。 Object of the present invention is a display device seeking energy corresponds to a small full-color moving image display and still image display of gray scale levels (digital display mode) so that two display, while significantly reducing the external device comprises an external display all the power consumption of the system LSI. 设有并能选择在一个像素内对应于两种显示的显示电路。 It provided corresponding to two and can be selected is displayed in a display pixel circuit. 另外,在选择了数字显示模式的情况下,由于停止向不需要的电路(例如DA转换器310、运算放大器311、时序控制器305)供给电源电压,所以能大幅度降低全体显示装置的功耗。 Under Further, in the digital display mode is selected, the power supply voltage is stopped due to an unnecessary circuit (e.g., a DA converter 310, an operational amplifier 311, a timing controller 305), it is possible to significantly reduce the entire power consumption of the display device .

Description

显示装置及其控制方法 Apparatus and control method thereof

技术领域 FIELD

本发明涉及显示装置,特别是涉及适合于能携带的显示装置中使用的显示装置。 The present invention relates to a display apparatus, particularly relates to a display apparatus suitable for a display device capable of carrying in use.

背景技术 Background technique

近年来,市场上需求能携带的显示装置,例如携带式电视、移动电话等。 In recent years, a display device capable of carrying the needs of the market, such as a portable TV, mobile phone and so on. 根据这样的要求,正盛行对应于显示装置的小型化、轻量化、低功耗的开发研究。 According to the requirements, corresponds to the prevailing positive small, lightweight, low power research and development of the display device.

图6表示现有例的液晶显示装置的一个显示像素的电路结构图。 6 shows a conventional example of a liquid crystal display device of the circuit configuration of a pixel of the display of FIG. 在绝缘性基板(图中未示出)上设有TFT70,该TFT70在栅极信号线51与漏极信号线61交叉部形成,而且在该交叉部附近连接到两条信号线51、61上。 An insulating substrate (not shown) provided on the TFT70, the TFT70 formed in the gate signal line 51 and the drain signal lines 61 intersecting portion, and in the vicinity of the intersecting portion is connected to the two signal lines 51, 61 . TFT65的源极11s连接到液晶21的显示电极80上。 The source 11s TFT65 is connected to the electrode 80 of the liquid crystal display 21.

另外,设有辅助电容85,用来在一场期间保持显示电极80的电压,该辅助电容85的一端86连接到TFT65的源极11s上,各显示像素公用的电位加到另一电极87上。 Further, a storage capacitor 85, the voltage to the display electrode 80 during a holding end 86 of the auxiliary capacitor 85 is connected to the source electrode 11S TFT65, each display pixel to a common potential is applied to the other electrode 87 . 这里,如果扫描信号加到栅极信号线51上,则TFT65呈导通状态,模拟视频信号从漏极信号线61被传递给显示电极80,同时保持在辅助电容85中。 Here, if a scan signal applied to the gate signal line 51, the TFT65 are turned on, and the analog video signal is transmitted from the drain signal line 61 to the display electrode 80, while held in the storage capacitor 85. 加在显示电极80上的视频信号电压被加到液晶21上,液晶21根据该电压进行取向,由此能获得液晶显示。 The video signal voltage applied to the display electrode 80 is applied to the liquid crystal 21, alignment of the liquid crystal 21 based on the voltage, whereby the liquid crystal display can be obtained. 因此,能获得与动态图像、静止图像无关的显示。 Thus it can be obtained regardless of the moving image, a still image display. 在这样的液晶显示装置上显示静止图像时,例如在移动电话的液晶显示部的一部分上进行驱动移动电话用的电池的余量显示,显示干电池的图像。 When the still image is displayed, for example on a portion of the liquid crystal display unit of a mobile phone apparatus for driving a mobile telephone in accordance with the remaining battery level display, display of the image display in such a dry crystal.

可是,在上述结构的液晶显示装置中,在显示静止图像的情况下,也与显示动态图像时一样,需要用扫描信号使TFT65呈导通状态,将视频信号再次写入各显示像素中。 However, a display device, in a case where the still image is displayed, with the same moving image display, it is necessary to TFT65 ON state by a scanning signal, the video signal is again written into each display pixel of the liquid crystal in the above-described structure. 因此,由于发生扫描信号及视频信号等驱动信号用的驱动电路、以及发生控制驱动电路的工作时序用的各种信号的外部LSI总是在工作,所以常常消耗大功率。 Accordingly, since the driving signal is a video signal and a scanning signal driving circuit and the like occurs, and external LSI various signal generating circuit controls the driving operation timing always work with, it is often consumed power. 因此,在只备有有限电源的移动电话等中,存在能使用的时间短的缺点。 Thus, with a limited power in a mobile phone or the like, there is a short time can be used drawbacks.

与此不同,在特开平8-194205号中公开了在各显示像素中备有静态型存储器的液晶显示装置。 In contrast, with the liquid crystal is disclosed a static type memory at each display pixel in the Japanese Patent Publication No. 8-194205 display device. 下面引用该公报的一部分进行说明,如图7所示,该液晶显示装置是将对两级反相器INV1、INV2进行正反馈型的存储器、即静态型存储器作为数字视频信号的保持电路用,借以降低消耗功率的。 The following portion of the publication will be described with reference to FIG. 7, the liquid crystal display device will be two inverters INV1, INV2 for positive feedback type memory, i.e., a static type memory holding circuit as the digital video signal by, thereby reducing power consumption. 这里,开关元件24根据静态型存储器中保持的双值数字视频信号,控制参照线Vref和显示电极80之间的电阻值,调整液晶21的偏压状态。 Here, the switching element 24 according to binary digital video signal held in a static type memory, and the display control line Vref reference resistance value between the electrodes 80, 21 to adjust the bias condition of the liquid crystal. 另一方面,将交流信号Vcom输入公用电极。 On the other hand, the input AC signal Vcom of the common electrode. 在理想情况下本装置如果像静止图像那样使显示图像变化,就不需要对存储器进行刷新。 This means that if the change of the display image as a still image, there is no need to refresh the memory in the ideal case.

如上所述,在现有的液晶显示装置中,适合于与模拟视频信号相对应显示全色动态图像。 As described above, in the apparatus, and adapted to display analog video signal corresponding to a full-color moving image display in the conventional liquid crystal. 另一方面,在备有保持数字视频信号用的静态型存储器的液晶显示装置中,适合于显示灰度等级低的静止图像,同时降低了功耗。 On the other hand, in the liquid crystal with a static type memory holding digital video signal for a display device, adapted to display low gradation still image, while reducing power consumption.

可是,由于两种液晶显示装置采用不同的视频信号源,所以在一个显示装置中不能同时实现全色动态图像显示和静态图像显示。 However, since both the liquid crystal display device using different video sources, so a display device can not simultaneously achieve a full-color moving image display and still image display. 另外,在用备有静态型存储器的液晶显示装置进行静止图像显示的情况下,没有进行过将各种控制信号输出给液晶显示装置的外部LSI的低功耗化的尝试。 Further, the liquid crystal display equipped with a static type memory in the case where a still image display apparatus, not been various attempts to control signal to the liquid crystal of low power consumption LSI external display device.

发明内容 SUMMARY

本发明是能够对应于用一个显示装置(例如一片液晶显示面板)进行全色动态图像显示和低功耗的静止图像显示这样两种显示。 The present invention is capable of corresponding with a display device (e.g. a liquid crystal display panel) for displaying a full color moving image and a still image with low-power display such two display. 另外,本发明谋求大幅度降低显示装置中包括外接的外部LSI的全部显示系统的功耗。 Further, the present invention seeks a significant reduction in power consumption of the display device outside of the LSI system includes all external display. 本申请中公开的发明中的主要内容说明如下。 The main content of the invention disclosed in the present application are described below.

即,本发明的显示装置有:沿基板上的一个方向配置的多条栅极信号线;将扫描信号依次供给上述栅极信号线的栅极驱动器;沿着与上述栅极线交叉的方向配置的多条漏极信号线;依次选择上述漏极信号线,将视频信号供给该漏极信号线的漏极驱动器;将时序控制信号供给上述栅极驱动器或/及漏极驱动器的时序控制电路;以及配置成矩阵状、由来自上述栅极信号线的扫描信号选择的、同时具有从上述漏极信号线供给视频信号的显示电极的显示装置包括:配置在每条上述显示电极上、将逐次输入的视频信号逐次供给上述显示电极的第一显示电路;对应于上述显示电极配置的、备有保持视频信号的保持电路,将与该保持电路保持的信号对应的电压供给上述显示电极的第二显示电路;选择上述第一及第二显示电路的电路选择电路;以及在选择了上述第二 That is, the display device of the present invention are: a plurality of gate signal lines disposed on the substrate in one direction; scan signals are sequentially supplied to the gate driver to the gate signal line; arranged along a direction crossing the gate line a plurality of drain signal lines; the drain signal lines are sequentially selected, the video signal is supplied to the drain driver drain signal line; timing of the timing control signal supplied to the gate driver and / or the drain driver and control circuit; and arranged in a matrix, selected by the scanning signal from the gate signal line, while the display device having a display electrode from the drain signal line is supplied to a video signal comprising: a display disposed on each of said electrodes, the sequential input a first display circuit video signals sequentially supplied to the display electrode; corresponds to the configuration of the display electrode, with the video signal holding circuit holds the holding voltage supplied to the second display signal corresponding to display electrodes of the holding circuit circuit; circuit selection circuit selects the first and second display circuit; and a second selected 显示电路时,停止向不需要工作的规定电路供给电源电压的停止控制电路。 When the display circuit, stopping the supply of power supply voltage to a predetermined circuit does not require the control circuit stops operating.

在选择了第二显示电路时,由于根据保持电路中保持的信号进行显示,与选择了第一显示电路的情况不同,出现不需要工作的电路。 When the second display circuit is selected, since the display signal holding circuit in accordance with the held, the selection of the first display circuit situation is different, the circuit does not require the work occurs. 因此,通过停止向这些不需要工作的规定电路供给电源电压,能大幅度地降低功耗。 Thus, a predetermined power supply voltage to these circuits do not need to work by stopping the power consumption can be greatly reduced.

另外,关于停止向什么样的电路供给电源电压,优选的实施例如下。 Further, regarding the implementation of a power supply voltage is stopped, it is preferable to what circuit is as follows.

即,在上述结构中,还备有将输入数字视频信号变换成模拟视频信号的DA变换电路,在选择了上述第二显示电路时,停止向上述DA变换电路供给电源电压。 That is, in the above structure, the input further comprises a digital video signal into an analog video signal conversion circuit DA, and when the second display circuit is selected stop the power supply voltage to the DA converter circuit. 由于DA变换电路有较大功耗,所以功率的降低效果大。 Since the DA conversion circuit has a larger power consumption, so a large effect of reducing power.

另外,除了上述的结构以外,还备有放大模拟视频信号的放大电路,在选择了上述第二显示电路时,停止向上述放大电路供给电源电压。 Further, in addition to the above-described configuration, further comprises a amplification circuit analog video signal, when the second display circuit is selected, stopping the supply of power supply voltage to the amplifier circuit. 由于放大电路也有较大的功耗,所以功率的降低效果大。 Since the amplifying circuit has a large power consumption, so that a large effect of reducing power.

另外,在上述结构中,在选择了上述第二显示电路时,停止向上述栅极驱动器或/及漏极驱动器供给电源电压。 Further, in the above-described configuration, the second display circuit is selected stop the power supply voltage to the gate driver or / and a drain driver. 由于栅极驱动器、漏极驱动器也有较大的功耗,所以功率的降低效果大。 Since the gate driver, the drain has a greater drive power, the large power reduction effect.

另外,在选择了上述第二显示电路时,停止向栅极驱动器和漏极驱动器供给电源电压。 Further, when the second display circuit is selected, stopping the supply of power supply voltage to the gate driver and drain driver.

另外,除了上述的结构以外,上述时序控制电路发生供给上述显示面板的液晶的对置电极的第一交流驱动信号,还备有:发生其周期比该第一交流驱动信号长的第二交流驱动信号的振荡器;以及在选择了上述第二显示电路时,从上述第一交流驱动信号切换到上述第二交流驱动信号的切换电路。 Further, besides the above configuration, the first timing control signal generating circuit of the liquid crystal AC driving of the counter electrode is supplied to the display panel, further provided with: the first long period of its AC drive signal than the second AC drive occurs oscillator signal; and when the second display circuit is selected, switching the first AC drive signal to the switching circuit from the second AC drive signal.

为了防止液晶变坏,需要将交流驱动信号供给对置电极,但在数字显示模式时由于显示面板的闪烁不成问题,所以与模拟显示模式时相比,即使是长周期的交流驱动信号也是充分的。 In order to prevent deterioration of the liquid crystal, it is necessary to AC drive signal supplied to the counter electrode, but not a problem since the scintillator panel display, when compared with analog display mode when the digital display mode, even if the exchange is a long period of the drive signal is sufficiently .

因此,根据上述模式切换信号,切换上述第一及第二交流驱动信号,能降低数字显示模式时的功耗。 Thus, according to the above mode switching signal, switching the first and second AC drive signal, to reduce power consumption of a digital display. 这里,就低功耗这一点来说,第二交流驱动信号的周期最好是大于一个垂直期间。 Here, on this low-power, the period of the second AC drive signal is preferably greater than a vertical period.

另外,在上述结构中,在选择了上述第二显示电路时,停止向上述时序控制电路供给电源电压。 Further, in the above-described configuration, the second display circuit is selected, the control circuit stops power supply voltage to the timing. 由于独立于时序控制电路备有发生第二交流驱动信号的振荡器,所以即使停止向时序控制电路供给电源电压也没有问题。 Since the oscillator is independent of the timing control circuit is provided with a second AC drive signal occurs, even if the timing control circuit stops the power supply voltage is not a problem. 因此,更能降低数字显示模式时的功耗。 Thus, power consumption can reduce the digital display mode.

附图说明 BRIEF DESCRIPTION

图1是本发明的实施例的液晶显示装置的电路结构图。 FIG. 1 is a circuit configuration diagram of a liquid crystal device according an embodiment of the present invention.

图2是本发明的实施例的视频信号的切换电路的电路结构图。 FIG 2 is a circuit configuration diagram of a video signal switching circuit of the embodiment of the present invention.

图3是本发明的实施例的液晶显示装置的另一电路结构图。 FIG 3 is a circuit diagram of another embodiment of a liquid crystal display of the present invention.

图4是本发明的实施例的液晶显示装置的时序图。 FIG 4 is a timing diagram of the embodiment of the liquid crystal display device of the present invention.

图5是反射型液晶显示装置的剖面图。 FIG 5 is a sectional view of the reflection type liquid crystal display.

图6是现有例的液晶显示装置的电路结构图。 FIG 6 is a circuit configuration diagram of a conventional example of a liquid crystal display.

图7是现有例的液晶显示装置的另一电路结构图。 FIG. 7 is a circuit diagram of another conventional example of a liquid crystal display.

具体实施方式 Detailed ways

其次,说明本发明的实施例的显示装置。 Next, the display device of the embodiment of the present invention. 图1中示出了将本发明的显示装置应用于液晶显示装置时的电路结构图。 FIG 1 shows a display device according to the present invention is applied to a circuit configuration diagram of a liquid crystal display device.

301是由触发电路302、303构成的延迟触发电路(DFF:DelayedFlip Flop)。 A delay circuit 301 is triggered by the trigger circuit 302, 303 constituting the (DFF: DelayedFlip Flop). 如果输入初级的触发电路302的显示模式切换信号DH呈高电平,则触发电路302与来自时序控制器305的垂直周期结束信号Vend同步地输出模式切换信号MD。 If the primary input display mode switching trigger signal DH circuit 302 goes high, the flip-flop circuit 302 from the timing controller 305 of the vertical period end signal Vend output in synchronization mode switching signal MD.

另外,触发电路303与下一个到来的垂直周期结束信号Vend同步地输出停止控制信号LA。 Further, the trigger circuit 303 with the next incoming vertical period end signal Vend stop control signal is output in synchronization LA. 模式切换信号MD、停止控制信号LA控制后面所述的各电路的工作。 Mode switching signal MD, a control signal is stopped the respective control circuit LA is described later.

时序控制器305根据系统时钟CLK、水平同步信号Hsync、垂直同步信号Vsync,输出面板控制信号PC、垂直期间结束信号Vend、对收容在显示面板100中的液晶的对置电极进行反转驱动用的交流驱动信号FRP及DA转换器310的工作时钟DACCLK。 The timing controller 305 according to the CLK system clock, a horizontal synchronization signal Hsync, a vertical synchronization signal Vsync, the PC output panel control signals, vertical period end signal Vend, accommodated inversion driving of the liquid crystal used in the display of the counter electrode 100 of the panel AC drive signal FRP and the DA converter 310 of the operation clock DACCLK. 这里,上述的面板控制信号PC中包含成为面板扫描信号的触发信号的水平启动脉冲STH、垂直启动脉冲STV。 Here, the panel control signal PC in a horizontal start pulse STH comprising trigger signal panel scanning signal, a vertical start pulse STV.

与门306输出使时序控制器305停止工作用的信号。 That the output of AND gate 306 and the timing controller 305 working with the stop signal. 上述的停止控制信号LA及显示模式切换信号DH被输入该与门中。 LA aforementioned stop control signal DH and display mode switching signal is input to the AND gate. 因此,时序控制器305在两信号呈高电平时停止工作(数字显示模式时)。 Thus, the timing controller 305 is stopped when the two signals goes high (when the digital display mode). 另外,显示模式切换信号DH变成低电平时,停止状态被解除,能返回到模拟显示模式。 Further, the display mode switching signal DH becomes the low level, the stop state is released, it can be returned to analog display mode.

另外,与时序控制器305独立地设置振荡器307。 Additionally, the oscillator 307 is provided independently and the timing controller 305. 振荡器307成为数字显示模式时的交流驱动信号的信号源,发生其周期比时序控制器305输出的交流驱动信号FRP的信号周期(通常为一个水平周期)长的交流驱动信号。 Oscillator 307 is a signal source AC drive signal when the digital display mode, the signal period of the AC drive signal FRP generating an output whose period than the timing controller 305 (usually a horizontal period) longer AC drive signal.

这里,如后面所述,在数字显示模式时,采用这样的结构,即,由静态的保持电路保持数字视频信号,同时根据该保持信号,选择加在显示电极上的信号,所以不会发生像模拟显示模式时那样因辅助电容的漏电引起的视频信号的衰减,因此用频率较低的交流驱动信号就足够了。 Here, as described later, when the digital display mode, such a configuration, i.e., the digital video signal held by the static hold circuit, while maintaining the basis of the signal, a selection signal is applied to the electrodes of the display, the image does not occur video signal attenuation as a result of leakage caused by the auxiliary capacitor analog display mode, and therefore with a lower frequency of the AC drive signal is sufficient. 而且,该信号周期为一个垂直周期(相当于60Hz)以上,适合于低功耗化。 Further, the signal period of a vertical period (corresponding to 60Hz) above, for low power consumption.

根据模式切换信号MD,由切换电路SW3切换振荡器307的输出和时序控制器305输出的交流驱动信号FRP,经运算放大器308放大后,被输入到对置电极端子COM中。 According to the MD mode switching signal, the AC drive signal FRP output from the oscillator 307 and the output timing controller 305 of the switching circuit SW3 is switched, amplified by the operational amplifier 308, is input to the terminal COM of the opposing electrode. 另外,振荡器307的输出信号由倒相电路309将相位反相,再由运算放大器315放大后输入到信号端子LSIG中。 Further, the output signal of the oscillator 307 by the inverter circuit 309 inverting the phase, then the input to the operational amplifier 315 amplifies the signal terminal LSIG. 如后面所述,这两个相位相反的信号对在数字显示模式中,被用来显示“白”或“黑”。 As described later, these two signals of opposite phase in the digital display mode, is used to display "white" or "black."

DA转换器310将从外部输入的R、G、B数字视频信号数据转换成模拟视频信号。 DA converter 310 from the external input R, G, B digital video data into an analog video signal. 这里,R、G、B各数字视频信号数据通常由8位构成。 Here, R, G, B data of each digital video signal typically consists of 8 bits. 其最高位的视频信号数据和经DA转换后再由运算放大器311放大的模拟视频信号被输入到切换电路SW1。 The highest bit video signal data and the DA converted by the operational amplifier 311 and then amplified analog video signal is input to the switching circuit SW1. 然后由切换电路SW1根据模式切换信号MD,切换该两个信号,输出给显示面板100的R、G、B端子。 Then the switching circuit SW1 is switched by a signal in accordance with the MD mode, the switching of the two signals is output to the display panel 100 R, G, B terminal.

另外,在本实施例中,后面所述的显示面板100内的保持数字视频信号数据用的保持电路由1位构成,所以只输出最高位,但如果将保持电路构成多位的,则能变更成输出与其对应的多位的数字视频信号的结构。 Further, in the present embodiment, the retainer 100 within the digital video signal data following the said display panel is constituted by a holding circuit, so that only the highest output, but if the number of holding circuit configuration, is able to change thereto to output multi-bit configuration corresponding to the digital video signal.

另外,切换电路SW2根据模式切换信号MD,将高电平或低电平输出给显示面板100的端子LVDD。 Further, the switching circuit SW2 is switched according to the mode signal MD, the high or low output to the display panel 100 of the terminal LVDD. 与此相对应,如后面所述,显示面板100被切换成模拟显示模式(LVDD=低电平)、数字显示模式(LVDD=高电平)。 Correspondingly, as described later, the display panel 100 is switched to the analog display mode (LVDD = low), a digital display (LVDD = high).

另外,电源电路320这样构成:根据电源输入,生成电源电压VDD1、VDD2(例如5V)、VCC1、VCC2(例如8~10V)、VEE1、VEE2(例如-4~-5V)。 Further, the power supply circuit 320 configured so that: according to the power input, generating a power supply voltage VDD1, VDD2 (for example 5V), VCC1, VCC2 (e.g. 8 ~ 10V), VEE1, VEE2 (e.g. -4 ~ -5V). 在电源电路320的各电源输出线321、322、323上设有切换电路SW4、SW5、SW6,根据上述的与门306的输出进行通断,能控制向规定电路供给VDD1、VCC1、VEE1。 The switching circuit SW4 is provided in the power supply circuit 320 of each power output line 321,322,323, SW5, SW6, turned on and off the output of AND gate 306 according to control supply VDD1, VCC1, VEE1 to a predetermined circuit.

这里,如果与门306的输出呈高电平,则切换电路SW4、SW5、SW6导通,停止向供给电源电压VDD1、VCC1、VEE1的电路、即DA转换器310、运算放大器311、时序控制器305、显示面板100的内部驱动器供电。 Here, if the output of AND gate 306 goes high, the switching circuit SW4, SW5, SW6 is turned on, stops the power supply voltage VDD1, VCC1, VEE1 circuit, i.e., the DA converter 310, an operational amplifier 311, a timing controller 305, 100 inside the display panel drive power.

其次,参照图2所示的时序图,说明上述结构的显示装置的工作。 Next, with reference to the timing chart shown in FIG. 2, the operation of the display device of the above-described configuration. 如果显示模式切换信号DH被切换成高电平,则模式切换信号MD与在垂直周期结束的时刻发生的垂直周期结束信号Vend的上升同步地上升,模式切换信号MD上升到高电平。 If the display mode switching signal DH is switched to a high level, the mode switching signal MD Vend rising signal rises in synchronism with the vertical period occurs at a time at the end of the vertical period, the mode switching signal MD is raised to the high level.

于是,利用切换电路SW2端子LVDD上升到高电平,显示面板100被切换成数字显示模式。 Thus, by the switching circuit SW2 terminal LVDD rises to a high level, the display panel 100 is switched to the digital display mode. 同时切换电路SW1被切换,最高位的数字视频信号数据被输出给R、G、B端子。 While the switching circuit SW1 is switched, the most significant bit of the digital video signal data is output to the R, G, B terminal. 另外,交流驱动信号(被输入到对置电极端子COM的信号)由切换电路SW3切换成低频。 Further, AC drive signal (signal to be inputted to the counter electrode terminal COM) is switched by the switching circuit SW3 into a low frequency. 这样一来,花费一个垂直周期(到下一个Vend上升为止的周期),数字视频信号数据被写入显示面板100的一场中。 Thus, it takes a vertical period (Vend rise up to the next cycle), the digital video signal data is written into a display panel 100.

如果写入用的一个垂直周期结束,下一个垂直周期结束信号Vend到来,则停止控制信号LA与其同步地上升。 If the writing end with a vertical period, the next vertical period end signal Vend comes, LA stop control signal rises in synchronism therewith. 于是,与门306的输出上升到高电平,据此,时序控制器305的工作停止。 Thus, rising to a high level and the output of AND gate 306, accordingly, the timing controller 305 to stop work. 即,各种面板控制信号PC、给DA转换器310的工作时钟DACCLK等输出信号被固定。 That is, various control signals the PC panels, work to the DA converter, etc. DACCLK clock output signal 310 is fixed. 因此,DA转换器310的工作也停止。 Thus, the work of the DA converter 310 is also stopped.

另外,随着与门306的输出上升到高电平,切换电路SW4、SW5、SW6被导通,停止向DA转换器310、运算放大器311、时序控制器305、显示面板100的内部驱动器供电。 Further, as the output of AND gate 306 rises to a high level, the switching circuit SW4, SW5, SW6 are turned on, is stopped 310, an operational amplifier 311, the timing controller 305 to the DA converter, the power supply driver inside the display panel 100.

这样,如果采用本发明,则在数字显示模式中,不仅使不需要的电路停止工作,而且停止供给电源电压,所以能够没有电路的静止消耗电流,能大幅度地降低功耗。 Thus, if the present invention, the digital display mode, only the unnecessary circuit to stop working, and stops supplying the power supply voltage, the circuit can be no static current consumption, the power consumption can be greatly reduced. 其效果仅为使工作停止时的约1/5。 The effect is only about 1/5 of the work to stop.

其次,在返回到模拟显示模式的情况下,显示模式切换信号DH被切换到低电平。 Secondly, in the case where the return to the analog display mode, the display mode switch is switched to the low level signal DH. 于是,与门306的输出呈低电平,所以时序控制器305再次开始工作。 Thus, the output of AND gate 306 go low, so the timing controller 305 start working again. 另外,如果模式切换信号下降到低电平,则切换电路SW1与垂直周期结束信号Vend同步地进行切换,以便输出从DA转换器输出的模拟视频信号。 Further, if the mode switching signal falls to a low level, the switching circuit SW1 and the vertical period end signal Vend switching synchronization to output analog video signal outputted from the DA converter. 同时,切换电路SW2进行切换,以便将来自时序控制器305的交流驱动信号FRP输出给端子COM。 Meanwhile, the switching circuit SW2 is switched to AC drive signal FRP from the output timing controller 305 to the terminal COM. 另外,切换电路SW3切换到VEE一侧,显示面板100被设定为通常的模拟显示模式。 Further, the switching circuit SW3 is switched to the side of VEE, the display panel 100 is set to the normal display mode simulation.

另外,如果与门306的输出呈低电平,则切换电路SW4、SW5、SW6被关断,再次开始向DA转换器310、运算放大器311、时序控制器305、显示面板100的内部驱动器供电。 Further, if the output of AND gate 306 goes low, the switching circuit SW4, SW5, SW6 are turned off, restarted the DA converter 310, an operational amplifier 311, a timing controller 305, a display panel 100 of the internal drive power. 其后,如果下一个垂直周期结束信号Vend到来,则停止控制信号LA下降到低电平。 Thereafter, if the next vertical period end signal Vend comes, LA stop control signal drops to a low level. 这样一来,显示面板100便返回到通常的模拟显示模式。 Thus, the display panel 100 returns to the normal analog display mode.

其次,参照图3详细说明显示面板100本体的电路结构。 Next, with reference to FIG. 3 described in detail the circuit configuration of the display panel 100 of the body. 在绝缘基板10上沿同一方向配置着连接到供给扫描信号的栅极驱动器50上的多条栅极信号线51,沿着与这些栅极信号线51交叉的方向配置着多条漏极信号线61。 10 disposed on the insulating substrate with a plurality of gate signal lines 50, 51 connected to the scanning signal is supplied to the gate driver in the same direction, arranged with a plurality of drain signal lines in a direction which intersects the gate signal line 51 61.

对应于从漏极驱动器60输出的取样脉冲的时刻,取样晶体管SP1、SP2、…、SPn导通,数据信号线62的数据信号被供给漏极信号线61。 Corresponds to a sampling pulse from the time the output from the drain driver 60, the sampling transistor SP1, SP2, ..., SPn data signal is turned on, the data signal line 62 is supplied to the drain signal line 61. 这里,数据信号线62的数据信号是对应于上述的显示面板100的外部切换电路SW1的切换而供给的数字视频信号或模拟视频信号(图1)。 Here, the data signal line 62 is a data signal corresponding to the switching of the display panel 100 of an external switching circuit SW1 is supplied to a digital video signal or analog video signal (FIG. 1).

液晶显示面板100这样构成:由来自栅极信号线51的扫描信号选择的、同时供给来自漏极信号线61的数据信号的多个显示像素200配置成矩阵状。 Such liquid crystal display panel 100 constituted by: simultaneously scanning signal supplied from a gate signal line 51 selected from a plurality of display pixel data signal 61 is a drain signal line 200 arranged in a matrix.

以下,说明显示像素200的详细结构。 Hereinafter, the detailed structure of the display pixel 200. 由P沟道型TFT41及N沟道型TFT42构成的电路选择电路40设置在栅极信号线51和漏极信号线61的交叉部附近。 TFT41 near the P-channel type and N-channel circuit selection TFT42 circuit 40 constituting the gate signal line 51 and the drain signal lines 61 intersecting portion. TFT41、42的两个漏极连接到漏极信号线61上,同时它们的两个栅极连接到选择信号线88上。 TFT41,42 two drain connected to the drain signal line 61, while their gates are connected to the two selection signal line 88. TFT41、42两者中的某一方根据来自选择信号线88的选择信号而导通。 Either one of the two TFT41,42 turned on according to a selection signal from the selection signal line 88. 另外,如后面所述,与电路选择电路40成对地设置电路选择电路43。 Further, as described later, a circuit selection circuit 40 is provided with the circuit selection circuit 43 in pairs. 这里,选择信号线88是从显示面板100的端子LVDD配置的信号线。 Here, the selection signal line 88 is a signal line terminal LVDD configuration panel 100 from the display.

能由电路选择电路40、43选择并切换后面所述的模拟视频信号的显示(对应于全色动态图像)和数字图像的显示(对应于低功耗、静止图像)。 Display can be selected by the switching circuit and the selection circuit 40, 43 behind the analog video signal (corresponding to a full color moving image) and display digital images (corresponding to a low power consumption, still image). 另外,与电路选择电路40相邻地配置由N沟道型TFT71及N沟道型TFT72构成的像素选择电路70。 Further, with the selecting circuit 40 disposed adjacent to the pixel circuit composed of N-channel and N-channel TFT72 TFT71 selection circuit 70. TFT71、72分别与电路选择电路40的TFT41、42串联连接,同时栅极信号线51连接到它们的两个栅极上。 TFT71,72 respectively connected TFT41,42 circuit selection circuit 40 in series, while the gate signal line 51 is connected to the two gates thereof. TFT71、72根据来自栅极信号线51的扫描信号,两者同时导通。 TFT71,72 scanning signal from the gate signal line 51, both turned on.

另外,设有保持模拟视频信号用的辅助电容85。 Further, a storage capacitor 85 holds the analog video-signal. 辅助电容85的一个电极86连接到TFT71的源极71a上。 85 a storage capacitor electrode 86 is connected to the source electrode TFT71 71a. 另一个电极87连接到公用的辅助电容线88上,供给偏压Vsc。 The other electrode 87 is connected to a common storage capacitor line 88, the supply bias voltage Vsc. 如果电路选择电路70的各TFT的栅极导通后,模拟视频信号加在液晶21上,则虽然该信号必须在一场期间保持住,但该信号的电压只在液晶21上随着时间的推移而逐渐降低。 If the gate-on circuit selects each TFT circuit 70, is applied to the analog video signal 21, while it must hold the signal during a liquid crystal, but the voltage of the signal only in the liquid crystal 21 as time Over gradually reduced. 如果这样的话,就会出现显示深浅不匀而不能获得良好的显示。 If this is the case, there will be unevenness in the display can not be a good display. 因此,为了使该电压在一场期间保持住要设置辅助电容85。 Therefore, in order for the hold voltage during a storage capacitor 85 to be set.

电路选择电路43的P沟道型TFT44设置在该辅助电容85和液晶21之间,与电路选择电路43的TFT41同时通断。 A circuit selection circuit 43 is a P-channel type TFT44 disposed between the auxiliary capacitor 85 and the liquid crystal 21, and the circuit selection circuit 43 while TFT41 off.

另外,保持电路110、信号选择电路120设置在像素选择电路70的TFT72和液晶21的显示电极80之间。 Further, the holding circuit 110, the signal selection circuit 120 is provided to select between the TFT72 and the electrodes 80 of the liquid crystal display 21 in the pixel circuit 70. 保持电路110由正反馈的两个倒相电路构成,构成保持数字双值的静态型存储器。 Holding circuit 110 is constituted by two positive feedback inverter circuit configured to maintain a static binary digital type memory.

另外,信号选择电路120是根据来自保持电路110的信号而选择信号的电路,构成两个N沟道型TFT121、122。 Further, the signal selection circuit 120 is a signal from the holding circuit 110 and a signal selection circuit, two N-channel type constituting TFT121,122. 来自保持电路110的互补的输出信号分别加在TFT121、122的栅极上,所以TFT121、122互补地通断。 Complementary output signals from the holding circuit 110 are respectively applied to the gate TFT121,122, so TFT121,122 off complementarily.

这里,如果TFT122导通,便选择交流驱动信号(信号B),如果TFT121导通,便选择对置电极信号VCOM(信号A),经过电路选择电路43的TFT45,供给将电压加到液晶21上的显示电极80上。 Here, if the TFT122 turns on, then select the AC drive signal (signal B), if turned on TFT121, the counter electrode signal has chosen the VCOM (signal A), through the circuit selection TFTs 45 circuit 43, the supply voltage is applied to the liquid crystal 21 the display electrodes 80. 这里,对置电极信号VCOM(信号A)相当于来自上述的振荡器307的信号,信号B相当于上述振荡器307的输出被反相的信号。 This is equivalent to a signal from the oscillator 307, the counter electrode signal the VCOM (signal A), B corresponds to the signal output of the oscillator signal 307 is inverted.

上述的结构可以概括如下:在一个显示像素200内设有由保持作为像素选择元件的TFT71及模拟视频信号的辅助电容构成的电路(第一显示装置)、以及由保持作为像素选择元件的TFT72、保持双值的数字视频信号的保持电路110、以及由信号选择电路120构成的电路(第二显示装置),另外,设有选择这两个电路用的电路选择电路40、43。 The above-described structure may be summarized as follows: In 200 equipped with a display pixel circuit (first display device), a pixel element selection TFT71 storage capacitor and analog video signals as configured by the holding, and the holding TFT 72 as a pixel select element, the digital video signal holding circuit 110 is held in binary, and the circuit configuration of the signal selection circuit 120 (second display device), further, the selection circuit is provided with two circuit selection circuits 40, 43.

其次,说明液晶面板200的外围电路。 Next, the peripheral circuit of the liquid crystal panel 200. 面板驱动用LSI91设置在与液晶面板200的绝缘性基板10不同的基板的外接电路基板90上。 LSI91 driving panel provided on the external circuit substrate different from the substrate with the insulating substrate 200 of the liquid crystal panel 1090. 垂直启动信号STV从该外接电路基板90的面板驱动用LSI91输入到栅极驱动器50上,水平启动信号STH被输入到漏极驱动器60上。 Vertical start signal STV from the panel drive circuit board 90 of the external input to the gate driver 50 with LSI91, the horizontal start signal STH is input to the drain driver 60. 另外,视频信号被输入到数据线62。 Further, the video signal is input to the data line 62. 这里,面板驱动用LSI91相当于上述的时序控制器305。 Here, the panel driving controller 305 corresponds to the timing with LSI91.

其次,参照图1至图4,说明上述结构的显示面板的驱动方法。 Next, referring to FIG. 1 to FIG. 4, the driving method of the display panel of the above structure. 图4是液晶显示装置选择了数字显示模式时的时序图。 FIG 4 is a liquid crystal display device is selected timing chart when the digital display mode.

(1)模拟显示模式的情况如果根据模式切换信号MD(低电平)选择了模拟显示模式,则由切换电路SW1设定成模拟视频信号被输出给数据信号线62的状态,同时电路选择信号线88的电位呈低电平,电路选择电路40、43的TFT41、44导通。 Show Mode (1) If the analog display switching signal MD (low level) of the analog mode according to the mode selected, by the switching circuit SW1 is set to the state analog video signal is output to the data signal line 62, while the signal selection circuit potential line 88 go low, the circuit selection circuits 40, 43 TFT41,44 conduction.

另外,根据基于水平启动信号STH的取样信号,取样晶体管SP导通,数据信号线62的模拟视频信号被供给漏极信号线61。 Further, according to the sampling signal based on the horizontal start signal STH, the sampling transistor SP is turned on, the data signal line 62 analog video signal is supplied to the drain signal line 61.

另外,基于垂直启动信号STV,扫描信号被供给栅极信号线51。 Further, the gate signal line 51 is supplied based on the vertical start signal STV, the scanning signal. 如果根据扫描信号,TFT71导通,则模拟视频信号Sig从漏极信号线61传递给显示电极80,同时被保持在辅助电容85中。 If the scanning signal, TFTs 71 is turned on, the analog video signal Sig is transmitted from the drain signal line 61 to the display electrode 80 while being held in the storage capacitor 85. 加到显示电极80上的视频信号电压加到液晶21上,根据该电压,通过对液晶21取向,能获得液晶显示。 Video signal voltage to the display electrode 80 applied on the LCD 21, based on the voltage, the alignment of the liquid crystal 21, the liquid crystal display can be obtained.

在该模拟显示模式中,由于逐次输入视频信号电压,所以适合于显示全色动态图像。 In the analog display mode, since the video signal is sequentially input voltage, adapted to display full-color moving image. 但是,在外接的电路基板90的LSI91、各驱动器50、60为了驱动它们而在不断地产生功耗。 However, LSI91 external circuit board 90, the drivers 50 and 60 in order to drive them and continue to produce power.

(2)数字显示模式如果根据模式切换信号MD(高电平)选择了数字显示模式,则设定成数字视频信号被输出给数据信号线62的状态,同时电路选择信号线88的电位呈高电平,保持电路110呈可工作状态。 (2) If the digital display mode switching signal MD (high level) in accordance with a digital display mode is selected, the status is set to a digital video signal is output to the data signal line 62, while the potential of the circuit selection signal line 88 as a high level, the holding circuit 110 as a workable state. 另外,电路选择电路40、43的TFT41、44关断,同时TFT42、45导通。 Further, the circuit selection circuits 40, 43 TFT41,44 off, while TFT42,45 turned.

另外,启动信号STV、STH从外接的电路基板90的面板驱动用LSI91(时序控制器305)输入到栅极驱动器50及漏极驱动器60中。 Further, a start signal STV, STH to the gate driver driving input 50 and a drain 60 with a drive LSI 91 (timing controller 305) from the panel external circuit board 90. 与此相对应,依次发生取样信号,根据各自的取样信号,取样晶体管SP1、SP2、…、SPn依次导通,对数字视频信号Sig进行取样,供给各漏极信号线61。 Correspondingly, occur sequentially sampling signal, sampled signal according to the respective sampling transistors SP1, SP2, ..., SPn sequentially turned on, the digital video signal Sig is sampled, the respective drain signal line 61 is supplied.

这里说明第一行、即施加扫描信号G1的栅极信号线51。 The first line described herein, i.e., the scanning signal G1 is applied to the gate signal line 51. 首先,借助于扫描信号G1,连接在栅极信号线51上的各显示像素P11、P12、…P1n的各TFT在一个水平扫描期间导通。 Each display pixel P11 First, when the scanning signals G1, is connected to the gate signal line 51, P12, ... P1n each during one horizontal scanning TFT is turned on.

注意第一行第一列的显示像素P11,借助于取样信号SP1,取样后的数字视频信号S11被输入到漏极信号线61。 Note that the first row and first column of the display pixels P11, by means of the sampling signal SP1, a digital video signal S11 is inputted to the sampling drain signal line 61. 然后,如果TFT72借助于扫描信号G1而呈导通状态,则该漏极信号D1被输入到保持电路110中。 Then, if the scanning signals G1 TFT72 by means of the ON state, the drain signal D1 is input to the holding circuit 110.

保持在该保持电路110中的信号被输入到信号选择电路120,在该信号选择电路120中选择信号A或信号B,该选择的信号被加到显示电极80上,其电压加到液晶21上。 Held in the signal holding circuit 110 is input to the signal selection circuit 120, the signal A or signal B is selected in the signal selection circuit 120, the selection signal is applied to the display electrode 80, the voltage applied to the liquid crystal 21 .

这样一来,通过从栅极信号线51至最后一行的栅极信号线51进行扫描,由一个画面(一场期间)的扫描、即通过全部点扫描而进行的数字信号的写入结束,根据保持电路110中写入的数字视频信号显示出一个画面。 Thus, the signal from the gate line by a gate signal line 5151 to the last scan line by a picture (field period) of scan, i.e., the end of writing the digital signal performed by scanning all the points, in accordance with the digital video signal written in the holding circuit 110 to display an image.

这里,如果一个画面被显示出来,如上所述,基于停止控制信号LA,停止向栅极驱动器50和漏极驱动器60、外接的面板驱动用LSI91(时序控制器305)等不需要的电路供电,制止对它们的驱动。 Here, if a screen is displayed, as described above, based on the stop control signal LA, and the drain driver 50 is stopped to the gate driver 60, the external panel driving LSI 91 does not need power supply circuit (timing controller 305) and the like, stop driving to them.

常常将电压VDD、VSS供给保持电路110以进行驱动,另外,将低频交流驱动信号VCOM(例如60Hz)供给液晶21的对置电极32,将各信号A及信号B供给选择电路120。 Often voltage VDD, VSS is supplied to the holding circuit 110 is driven further, low frequency AC drive signal the VCOM (e.g. 60Hz) supplied to the counter electrode 21 of the liquid crystal 32, the respective signals A and B supplied to the signal selection circuit 120. 即,在交流驱动信号VCOM加到对置电极32上、液晶显示面板100为常白(NW)的情况下,对信号A施加与对置电极32相同的交流驱动信号VCOM,对信号B施加与信号A相位相反的交流驱动信号。 That is, the AC drive signal VCOM applied to the case where the counter electrode 32, the liquid crystal display panel 100 is a normally white (NW), the signal A applied to the same AC drive signal VCOM counter electrode 32, and applied to the signal B a signal of a phase opposite to the AC drive signal.

这时,在漏极信号线61上数字视频信号呈高电平被输入保持电路110中的情况下,在信号选择电路120中,低电平被输入到第一TFT121中,所以第一TFT121被关断,高电平被输入到另一个第二TFT122中,所以第二TFT122被导通。 In this case, the drain signal line 61 goes high the digital video signal is input to the holding circuit 110, the signal selection circuit 120 in the low level is inputted to the first TFT121, the first being TFT121 oFF, a high level is input to the other in a second TFT122, the second TFT122 is turned on.

如果这样做,则选择信号B,与对置电极32相位相反的信号B的电压被加在液晶的显示电极80上,液晶由于电场的作用而竖立,所以在常白的显示面板上显示出来时能观察到黑色显示。 If this is done, the selection signal B, the voltage signal B and the 32 phase counter electrode opposing is applied to the display electrodes of the liquid crystal 80, the liquid crystal due to the electric field erected, it is displayed on the normally white display panel observed black display.

在漏极信号线61上数字视频信号呈低电平被输入到保持电路110中的情况下,在信号选择电路120中,高电平被输入到第一TFT121中,所以第一TFT121导通,低电平被输入另一个第二TFT122中,所以第二TFT122关断。 In digital video signal on a low drain signal line 61 is input to the holding circuit 110, the signal selection circuit 120 in the high level is inputted to the first TFT121, the first conductive TFT121, the low level is input in another second TFT122, the second TFT122 off. 如果这样做,则选择信号A,信号A被加到液晶上。 If so, then the selection signal A, the signal A is applied to the liquid crystal. 即,由于施加与对置电极32相位相同的信号,所以不发生电场,液晶不竖立,所以在常白的显示面板上显示出来时能观察到白色显示。 That is, due to the application phase the counter electrode 32 and the same signal, so the electric field does not occur, the liquid crystal is not erected, so the normally white display panel can be observed when white display is displayed.

在该数字显示模式中,写入一个画面并对它进行保持,由此能显示静止图像,由于停止各驱动器50、60及LSI91等的驱动及电源的供给,所以能大幅度降低功耗。 In this digital display mode, it writes a picture and holds, whereby a still image can be displayed by stopping the supply of the drivers 50 and 60 and the like LSI91 drive and power, it is possible to significantly reduce power consumption.

本发明的显示装置能很好地应用于液晶显示装置中、特别是反射型液晶显示装置中。 The display device according to the present invention can be well applied to the liquid crystal display device, particularly a reflection type liquid crystal display device. 因此,参照图5说明该反射型液晶显示装置的结构。 Thus, the structure of the apparatus described with reference to FIG 5 the reflection type liquid crystal display.

如图5所示,在一片绝缘性基板10上、且在由多晶硅构成的呈岛状的半导体层11上形成栅极绝缘膜12,在半导体层11的上方、在栅极绝缘膜12上形成栅极13。 As shown, on an insulating substrate 10, and a gate insulating film formed on the semiconductor layer in an island shape is made of polysilicon 11 512, over the semiconductor layer 11 is formed on the gate insulating film 12 The gate 13.

在位于栅极13的两侧的下层半导体层11上形成源极11s及漏极11d。 Forming a source electrode 11s and drain electrode 11d on the lower semiconductor layer 13 located on both sides of the gate electrode 11. 将层间绝缘膜14淀积在栅极13及栅极绝缘膜12上,在对应于该漏极11d的位置及对应于源极11s的位置形成接触孔15,漏极11d经过该接触孔15连接在漏极16上,源极11s经过设置在层间绝缘膜14上的平坦化绝缘膜17上设置的接触孔18,连接到显示电极19上。 15, the drain 11d of the interlayer insulating film 14 is deposited on the gate electrode 13 and the gate insulating film 12, a contact hole is formed at a position corresponding to the drain 11d and source 11s corresponds to the position of the contact hole 15 through which the connected to the drain 16, source electrode 11s via a contact hole 17 provided on the planarization insulating film 14 on the interlayer insulating film 18, the electrode 19 is connected to the display.

在平坦化绝缘膜17上形成的各显示电极19由铝(Al)等反射材料构成。 Each display electrode is formed on the planarization insulating film 1719 is made of aluminum (Al) and the like reflective material. 在各显示电极19及平坦化绝缘膜17上形成由使液晶21取向的聚酰亚胺等构成的取向膜20。 Each display electrode 19 and the planarization insulating film 17 is formed on the liquid crystal alignment of the alignment film 21 made of polyimide or the like 20.

在另一片绝缘性基板30上依次形成呈红(R)、绿(G)、蓝(B)各色的滤色片31、由ITO(Indium Tin Oxide,氧化铟锡)等透明导电膜构成的对置电极32以及使液晶21取向的取向膜33。 Were sequentially formed red (R) on the other insulating substrate sheet 30, the green (G), blue (B) color color filter 31, a transparent conductive film made of ITO (Indium Tin Oxide, Indium Tin Oxide) or the like 32 and counter electrode 21 of the liquid crystal alignment of the alignment film 33. 在不进行彩色显示的情况下,不需要滤色片31。 Without color display, the color filter 31 need not.

利用粘结性密封材料将这样形成的一对绝缘性基板10、30的周边粘结起来,将液晶21充填到由此形成的空隙中,制成反射型液晶显示装置。 The thus formed by adhesive sealant material of the insulating substrate of the pair of peripheral bonding 10, 30 together, the liquid crystal 21 is filled into the space thus formed, made of a reflective type liquid crystal display device.

如图中虚线箭头所示,从观察者1一侧入射的外部光从对置电极基板30依次入射,被显示电极19反射后,从观察者1一侧出射,观察者1能观察到显示。 FIG, 1 is incident from the observer side of the external light are sequentially incident from the opposing electrode substrate 30 as indicated with arrows, is displayed after the reflective electrode 19, an exit side from a viewer, a viewer can observe the display.

这样,反射型液晶显示装置是使外部光反射以观察显示的方式,无须像透射型液晶显示装置那样在与观察者相反的一侧使用所谓的背光,所以无须使该背光点亮用的电力。 Thus, the reflection type liquid crystal display device is an external light reflection in a way to observe the display without as transmissive liquid crystal display device as in the use of the viewer side opposite to a so-called backlight, it is not necessary that the electric power for lighting of the backlight. 因此,作为本发明的显示装置,是一种适用于无须背光、功耗低的反射型液晶显示装置。 Therefore, the display device according to the present invention, without a suitable backlight, low power consumption reflection-type liquid crystal display device.

在上述的实施例中,给出了在一个画面的全部点扫描期间,施加对置电极电压、以及信号A和B的电压的情况,但本发明不限定于此,在该期间也可以不施加这些电压。 In the above embodiment, the case where the given point during the entire scanning of one screen, the voltage applied to the counter electrode, and the voltage signals A and B, but the present invention is not limited thereto, and may not be applied during the these voltages. 可是为了降低功耗,以不施加这些电压为宜。 However, in order to reduce power consumption, such as not applying appropriate voltages.

另外,在上述的实施例中,虽然说明了在数字显示模式中输入1位的数字数据信号的情况,但本发明不限定于此,即使在多位的数字数据信号的情况下也能应用。 Further, in the above embodiment, the case has been described a digital data input signal in the digital display mode, but the present invention is not limited thereto, it can be applied even in the case of multi-bit digital data signals. 通过这样做,能进行多灰度的显示。 , Multi-gradation display can be performed by doing so. 这时,有必要使保持电路及信号选择电路的数目对应于输入的位数。 In this case, it is necessary to maintain the number of circuits and the signal selection circuit corresponds to the input number of bits.

另外,在上述的实施例中,虽然说明了将静止图像显示在液晶显示面板的一部分上的情形,但本申请不限定于此,也能将静止图像显示在全部显示像素上,这是本申请发明特有的效果。 Further, in the above embodiment, although the description has been still image is displayed on a part of the case of the liquid crystal display panel, but the present application is not limited thereto, and can display the still images on all of the display pixels, which is the present application invention, a unique effect.

在上述的实施例中,虽然说明了反射型液晶显示装置的情况,但在一像素内除了TFT、保持电路、信号选择电路及信号布线以外的区域,通过配置透明电极,也能用于透射型液晶显示装置。 In the above embodiment, although the case described reflection type liquid crystal display device, but in addition to the TFT, the holding circuit, and the signal selection circuit signal wiring area within a pixel, by arranging a transparent electrode, the transmissive type can also be used The liquid crystal display device.

如果采用本发明的显示装置,则能用一个显示面板选择模拟显示模式的全色动态图像显示,以及数字显示模式的对应于低功耗的灰度级数少的静止图像显示这样两种显示。 If the display device of the present invention, it can display a full-color moving image display mode selection panel analog display, digital display, and a display mode corresponding to two such small number of gray levels displayed in the still image with low power consumption.

特别是在选择了数字显示模式的情况下,由于不仅停止了不需要的电路的工作,而且停止了供电,所以能大幅度地降低显示装置整体的功耗。 Especially under the digital display mode is selected in the case where, since not only do not need to stop the operation of the circuit, and power supply is stopped, it is possible to significantly reduce the overall power consumption of the display device.

因此,在将本发明的显示装置用于使用电池等有限电源的携带式电视、移动电话的情况下,由于功耗少,所以能长时间地显示。 Thus, in the case of a portable television display device according to the present invention is used for a limited power supply such as a battery, the mobile phone, since the power consumption is low, it is possible to display a long time.

Claims (15)

1.一种显示装置,具有:沿基板上的一个方向配置的多条栅极信号线;将扫描信号依次供给上述栅极信号线的栅极驱动器;沿着与上述栅极线交叉的方向配置的多条漏极信号线;依次选择上述漏极信号线,将视频信号供给该漏极信号线的漏极驱动器;将时序控制信号供给上述栅极驱动器或/及漏极驱动器的时序控制电路;以及配置成矩阵状、由来自上述栅极信号线的扫描信号选择的、同时从上述漏极信号线供给视频信号的显示电极,其特征在于,备有:配置在每条上述显示电极上、将逐次输入的视频信号逐次供给上述显示电极的第一显示电路;对应于上述显示电极配置的、备有保持视频信号的保持电路,将与该保持电路保持的信号对应的电压供给上述显示电极的第二显示电路;选择上述第一及第二显示电路的电路选择电路;以及在选择了上述第二显 1. A display device, comprising: a plurality of gate signal lines arranged in one direction on the substrate; scanning signals are sequentially supplied to the gate driver to the gate signal line; arranged along a direction crossing the gate line a plurality of drain signal lines; the drain signal lines are sequentially selected, the video signal is supplied to the drain driver drain signal line; timing of the timing control signal supplied to the gate driver and / or the drain driver and control circuit; and arranged in a matrix, selected by the scanning signal from the gate signal line, while the drain electrode from the display signal supplied to the video line signal, characterized in comprising: a display disposed on each of said electrodes, the a first display circuit sequentially input video signal sequentially supplied to the display electrode; corresponds to the configuration of the display electrode, with the video signal holding circuit holds the holding of the display electrode voltage supply circuit corresponding to the signal held by the two display circuit; circuit selection circuit selects the first and second display circuit; and a selected second significant 电路时,停止向不需要工作的规定电路供给电源电压的停止控制电路。 When the circuit is stopped to stop the power supply circuit a predetermined voltage to the control circuit does not need to work.
2.如权利要求1所述的显示装置,其特征在于,上述停止控制电路包括:基于垂直周期结束信号延迟从外部输入的显示模式切换信号,产生停止控制信号的延迟触发电路;以及施加了该停止控制信号和上述显示模式切换信号的门电路,根据该门电路的输出,停止向不需要工作的规定电路供给电源电压。 2. The display device according to claim 1, wherein said stop control circuit comprises: a display mode end signal is inputted from an external delay based on the vertical period of the switching signal, generating a control signal to stop the delay flip-flop circuit; and applying the stop control signal and the display mode switching signal gate circuit, an output of the gate circuit stops supplying power supply voltage to a predetermined circuit does not need to work.
3.如权利要求1或2所述的显示装置,其特征在于,还备有将输入数字视频信号转换成模拟视频信号的DA转换电路;在选择了上述第二显示电路时,上述停止控制电路停止向上述DA转换电路提供电源电压。 The display device according to claim 1, wherein further comprises a DA conversion circuit converts the input digital video signal into an analog video signal; when the second display circuit is selected, the stop control circuit stops supplying the power supply voltage to the DA converter circuit.
4.如权利要求1或2所述的显示装置,其特征在于,还备有放大模拟视频信号的放大电路,在选择了上述第二显示电路时,上述停止控制电路停止向上述放大电路供给电源电压。 The display device of claim 1 or claim 2, wherein the amplification circuit further comprises a analog video signal, when the second display circuit is selected, the stop control circuit stops supply of power to the amplifier circuit Voltage.
5.如权利要求1所述的显示装置,其特征在于,在选择了上述第二显示电路时,上述停止控制电路停止向上述栅极驱动器或/及漏极驱动器供给电源电压。 The display device according to claim 1, wherein, when the second display circuit is selected, the stop control circuit stops power supply voltage to the gate driver or / and a drain driver.
6.如权利要求1或2所述的显示装置,其特征在于,上述时序控制电路发生供给上述显示面板的液晶的对置电极的第一交流驱动信号,同时还备有发生其周期比该第一交流驱动信号长的第二交流驱动信号的振荡器;以及在选择了上述第二显示电路时,从上述第一交流驱动信号切换到上述第二交流驱动信号的切换电路。 The display device of claim 1 or claim 2, wherein said first timing control signal generating circuit of the liquid crystal AC driving of the counter electrode is supplied to the display panel, and also with the ratio of the first period of its occurrence a second AC drive signal for driving the AC length oscillator signal; and when in the second display circuit is selected, switching the first AC drive signal to the switching circuit from the second AC drive signal.
7.如权利要求6所述的显示装置,其特征在于,第二交流驱动信号的周期大于一个垂直期间。 The display device according to claim 6, characterized in that the period of the second AC drive signal is larger than a vertical period.
8.如权利要求5所述的显示装置,其特征在于,在选择了上述第二显示电路时,上述停止控制电路停止向上述时序控制电路供给电源电压。 The display device according to claim 5, wherein, when the second display circuit is selected, the stop control circuit stops the control circuit power supply voltage to the timing.
9.一种显示装置的控制方法,该显示装置备有:沿基板上的一个方向配置的多条栅极信号线;将扫描信号依次供给上述栅极信号线的栅极驱动器;沿着与上述栅极线交叉的方向配置的多条漏极信号线;依次选择上述漏极信号线,将视频信号供给该漏极信号线的漏极驱动器;将时序控制信号供给上述栅极驱动器或/及漏极驱动器的时序控制电路;以及配置成矩阵状、由来自上述栅极信号线的扫描信号选择的、同时从上述漏极信号线供给视频信号的显示电极;配置在每条上述显示电极上、将逐次输入的视频信号逐次供给上述显示电极的第一显示电路;具有对应于上述显示电极配置,保持视频信号的保持电路,将与该保持电路保持的信号对应的电压供给上述显示电极的第二显示电路;选择上述第一及第二显示电路的电路选择电路;以及根据从外部输入的显 A method of controlling a display device, the display device provided with: a plurality of gate signal lines disposed on the substrate in one direction; scan signals are sequentially supplied to the gate driver to the gate signal line; along with the above-described gate lines intersecting the plurality of drain signal lines disposed in a direction; sequentially selects the drain signal line, the video signal supplied to the drain driver of the drain signal lines; the timing control signal supplied to the gate driver or / and a drain the timing of the control gate driver circuit; and arranged in a matrix, selected by the scanning signal from the gate signal line, while the drain signal line from the display of the video signal supplied to the electrode; disposed on each of the display electrode, the a first display circuit sequentially input video signal sequentially supplied to the display electrode; a configuration corresponding to the display electrode, the video signal holding circuit, holding the voltage supplied to the second display signal corresponding to the display electrode of the holding circuit circuit; circuit selection circuit selects the first and second display circuit; and a significant input from the outside in accordance with 模式切换信号,停止电源电压的供给的停止控制电路,该显示装置的控制方法的特征在于,在选择了上述第二显示电路时,上述停止控制电路停止向不需要工作的规定电路供给电源电压。 Stop mode switching signal, stops supplying the power supply voltage control circuit, a control method of the display device is characterized in that, when the second display circuit is selected, the stop control circuit stops power supply circuit for supplying a predetermined voltage is not required to work.
10.如权利要求9所述的显示装置的控制方法,其特征在于,在选择了上述第二显示电路时,停止向显示装置的DA转换电路供给电源电压。 10. The control method of the display apparatus according to claim 9, wherein, when the second display circuit is selected, the DA conversion circuit stops the display device power supply voltage.
11.如权利要求9所述的显示装置的控制方法,其特征在于,在选择了上述第二显示电路时,停止控制电路停止向放大显示装置的模拟信号的放大电路供给电源电压。 11. The control method of a display device according to claim 9, wherein, when the second display circuit is selected, the control circuit stops the enlarged display amplifying circuit stops power supply voltage of the analog signal device.
12.如权利要求9所述的显示装置的控制方法,其特征在于,在选择了上述第二显示电路时,停止控制电路停止向上述栅极驱动器或/及漏极驱动器供给电源电压。 12. The control method of the display apparatus according to claim 9, wherein, when the second display circuit is selected, the control circuit stops power supply to stop voltage to the gate driver or / and a drain driver.
13.如权利要求9所述的显示装置的控制方法,其特征在于,在选择了上述第二显示电路时,与选择了上述第一显示电路时相比,使对对置电极进行反相驱动用的交流驱动信号呈长周期。 Compared to the opposing electrode 13. The inverting drive control method of display device according to claim 9, wherein, when the second display circuit is selected, the selected first display circuit the AC drive signal with the elongated period.
14.如权利要求9所述的显示装置的控制方法,其特征在于,在选择了上述第二显示电路时,与垂直同步信号相比,使对对置电极进行反相驱动用的交流驱动信号呈长周期。 14. The control method of a display device according to claim 9, wherein, when the second display circuit is selected, as compared with the vertical synchronization signal, the AC drive signal to the counter electrode inversion driving with elongated period.
15.如权利要求9所述的显示装置的控制方法,其特征在于,在选择了上述第二显示电路时,停止控制电路停止向上述时序控制电路供给电源电压。 15. The control method of a display device according to claim 9, wherein, when the second display circuit is selected, the control circuit stops the control circuit stops power supply voltage to the timing.
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